31231020120 has 64 divisors (see below), whose sum is σ = 97766680320. Its totient is φ = 7966172544.

The previous prime is 31231019987. The next prime is 31231020131. The reversal of 31231020120 is 2102013213.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31231020120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5655034 + ... + 5660553.

It is an arithmetic number, because the mean of its divisors is an integer number (1527604380).

Almost surely, 2^31231020120 is an apocalyptic number.

31231020120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31231020120 is an abundant number, since it is smaller than the sum of its proper divisors (66535660200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31231020120 is a wasteful number, since it uses less digits than its factorization.

31231020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11315624 (or 11315620 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31231020120 its reverse (2102013213), we get a palindrome (33333033333).

The spelling of 31231020120 in words is "thirty-one billion, two hundred thirty-one million, twenty thousand, one hundred twenty".